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<a class="list-group-item" href="#navigation-8306" data-toggle="collapse" data-parent="#navigation">yii\db\cubrid <b class="caret"></b></a><div id="navigation-8306" class="submenu panel-collapse collapse"><a class="list-group-item" href="./yii-db-cubrid-columnschemabuilder.html">ColumnSchemaBuilder</a>
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<a class="list-group-item" href="./yii-db-cubrid-schema.html">Schema</a></div>
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<a class="list-group-item" href="./yii-db-mssql-sqlsrvpdo.html">SqlsrvPDO</a>
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<a class="list-group-item" href="./yii-db-mysql-querybuilder.html">QueryBuilder</a>
<a class="list-group-item" href="./yii-db-mysql-schema.html">Schema</a></div>
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<a class="list-group-item" href="./yii-db-oci-querybuilder.html">QueryBuilder</a>
<a class="list-group-item" href="./yii-db-oci-schema.html">Schema</a></div>
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    <div class="col-md-9 api-content" role="main">
        <h1>Class yii\db\ColumnSchemaBuilder</h1>
<div class="top-nav">
    <a href="index.html">All Classes</a>
            | <a href="#properties">Properties</a>
                | <a href="#methods">Methods</a>
                    | <a href="#constants">Constants</a>
    </div>

<table class="summaryTable docClass table table-bordered">
    <colgroup>
        <col class="col-name" />
        <col class="col-value" />
    </colgroup>
            <tr><th>Inheritance</th><td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a> &raquo;
<a href="yii-base-object.html">yii\base\Object</a></td></tr>
                <tr><th>Implements</th><td><a href="yii-base-configurable.html">yii\base\Configurable</a></td></tr>
                        <tr><th>Subclasses</th><td><a href="yii-db-cubrid-columnschemabuilder.html">yii\db\cubrid\ColumnSchemaBuilder</a>, <a href="yii-db-mysql-columnschemabuilder.html">yii\db\mysql\ColumnSchemaBuilder</a>, <a href="yii-db-oci-columnschemabuilder.html">yii\db\oci\ColumnSchemaBuilder</a>, <a href="yii-db-sqlite-columnschemabuilder.html">yii\db\sqlite\ColumnSchemaBuilder</a></td></tr>
                        <tr><th>Available since version</th><td>2.0.6</td></tr>
                    <tr>
          <th>Source Code</th>
          <td><a href="https://github.com/yiisoft/yii2/blob/master/framework/db/ColumnSchemaBuilder.php">https://github.com/yiisoft/yii2/blob/master/framework/db/ColumnSchemaBuilder.php</a></td>
        </tr>
    </table>

<div class="class-description">
    <p><strong>ColumnSchemaBuilder helps to define database schema types using a PHP interface.</strong></p>
    <p>See <a href="yii-db-schemabuildertrait.html">yii\db\SchemaBuilderTrait</a> for more detailed description and usage examples.</p>

    </div>

<a id="properties"></a>

<div class="summary doc-property">
<h2>Public Properties</h2>

<p><a href="#" class="toggle">Hide inherited properties</a></p>

<table class="summary-table table table-striped table-bordered table-hover">
<colgroup>
    <col class="col-property" />
    <col class="col-type" />
    <col class="col-description" />
    <col class="col-defined" />
</colgroup>
<tr>
  <th>Property</th><th>Type</th><th>Description</th><th>Defined By</th>
</tr>
                <tr id="$categoryMap">
        <td><a href="yii-db-columnschemabuilder.html#$categoryMap-detail">$categoryMap</a></td>
        <td><a href="http://www.php.net/language.types.array">array</a></td>
        <td>Mapping of abstract column types (keys) to type categories (values).</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
                <tr id="$comment">
        <td><a href="yii-db-columnschemabuilder.html#$comment-detail">$comment</a></td>
        <td><a href="http://www.php.net/language.types.string">string</a></td>
        <td>Comment value of the column.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
            <tr id="$db">
        <td><a href="yii-db-columnschemabuilder.html#$db-detail">$db</a></td>
        <td><a href="yii-db-connection.html">yii\db\Connection</a></td>
        <td>The current database connection.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
                                </table>
</div>

<div class="summary doc-property">
<h2>Protected Properties</h2>

<p><a href="#" class="toggle">Hide inherited properties</a></p>

<table class="summary-table table table-striped table-bordered table-hover">
<colgroup>
    <col class="col-property" />
    <col class="col-type" />
    <col class="col-description" />
    <col class="col-defined" />
</colgroup>
<tr>
  <th>Property</th><th>Type</th><th>Description</th><th>Defined By</th>
</tr>
        <tr id="$after">
        <td><a href="yii-db-columnschemabuilder.html#$after-detail">$after</a></td>
        <td><a href="http://www.php.net/language.types.string">string</a></td>
        <td>The column after which this column will be added.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
            <tr id="$append">
        <td><a href="yii-db-columnschemabuilder.html#$append-detail">$append</a></td>
        <td>mixed</td>
        <td>SQL string to be appended to column schema definition.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
                <tr id="$check">
        <td><a href="yii-db-columnschemabuilder.html#$check-detail">$check</a></td>
        <td><a href="http://www.php.net/language.types.string">string</a></td>
        <td>The <code>CHECK</code> constraint for the column.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
                    <tr id="$default">
        <td><a href="yii-db-columnschemabuilder.html#$default-detail">$default</a></td>
        <td>mixed</td>
        <td>Default value of the column.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
            <tr id="$isFirst">
        <td><a href="yii-db-columnschemabuilder.html#$isFirst-detail">$isFirst</a></td>
        <td><a href="http://www.php.net/language.types.boolean">boolean</a></td>
        <td>Whether this column is to be inserted at the beginning of the table.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
            <tr id="$isNotNull">
        <td><a href="yii-db-columnschemabuilder.html#$isNotNull-detail">$isNotNull</a></td>
        <td><a href="http://www.php.net/language.types.boolean">boolean</a>|<a href="http://www.php.net/language.types.null">null</a></td>
        <td>Whether the column is or not nullable.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
            <tr id="$isUnique">
        <td><a href="yii-db-columnschemabuilder.html#$isUnique-detail">$isUnique</a></td>
        <td><a href="http://www.php.net/language.types.boolean">boolean</a></td>
        <td>Whether the column values should be unique.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
            <tr id="$isUnsigned">
        <td><a href="yii-db-columnschemabuilder.html#$isUnsigned-detail">$isUnsigned</a></td>
        <td><a href="http://www.php.net/language.types.boolean">boolean</a></td>
        <td>Whether the column values should be unsigned.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
            <tr id="$length">
        <td><a href="yii-db-columnschemabuilder.html#$length-detail">$length</a></td>
        <td><a href="http://www.php.net/language.types.integer">integer</a>|<a href="http://www.php.net/language.types.string">string</a>|<a href="http://www.php.net/language.types.array">array</a></td>
        <td>Column size or precision definition.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
            <tr id="$type">
        <td><a href="yii-db-columnschemabuilder.html#$type-detail">$type</a></td>
        <td><a href="http://www.php.net/language.types.string">string</a></td>
        <td>The column type definition such as INTEGER, VARCHAR, DATETIME, etc.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
    </table>
</div>

<a id="methods"></a>

<div class="summary doc-method">
<h2>Public Methods</h2>

<p><a href="#" class="toggle">Hide inherited methods</a></p>

<table class="summary-table table table-striped table-bordered table-hover">
<colgroup>
    <col class="col-method" />
    <col class="col-description" />
    <col class="col-defined" />
</colgroup>
<tr>
  <th>Method</th><th>Description</th><th>Defined By</th>
</tr>
        <tr class="inherited" id="__call()">
        <td><a href="yii-base-object.html#__call()-detail">__call()</a></td>
        <td>Calls the named method which is not a class method.</td>
        <td><a href="yii-base-object.html">yii\base\Object</a></td>
    </tr>
            <tr id="__construct()">
        <td><a href="yii-db-columnschemabuilder.html#__construct()-detail">__construct()</a></td>
        <td>Create a column schema builder instance giving the type and value precision.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
            <tr class="inherited" id="__get()">
        <td><a href="yii-base-object.html#__get()-detail">__get()</a></td>
        <td>Returns the value of an object property.</td>
        <td><a href="yii-base-object.html">yii\base\Object</a></td>
    </tr>
            <tr class="inherited" id="__isset()">
        <td><a href="yii-base-object.html#__isset()-detail">__isset()</a></td>
        <td>Checks if a property is set, i.e. defined and not null.</td>
        <td><a href="yii-base-object.html">yii\base\Object</a></td>
    </tr>
            <tr class="inherited" id="__set()">
        <td><a href="yii-base-object.html#__set()-detail">__set()</a></td>
        <td>Sets value of an object property.</td>
        <td><a href="yii-base-object.html">yii\base\Object</a></td>
    </tr>
            <tr id="__toString()">
        <td><a href="yii-db-columnschemabuilder.html#__toString()-detail">__toString()</a></td>
        <td>Builds the full string for the column's schema</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
            <tr class="inherited" id="__unset()">
        <td><a href="yii-base-object.html#__unset()-detail">__unset()</a></td>
        <td>Sets an object property to null.</td>
        <td><a href="yii-base-object.html">yii\base\Object</a></td>
    </tr>
            <tr id="after()">
        <td><a href="yii-db-columnschemabuilder.html#after()-detail">after()</a></td>
        <td>Adds an <code>AFTER</code> constraint to the column.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
            <tr id="append()">
        <td><a href="yii-db-columnschemabuilder.html#append()-detail">append()</a></td>
        <td>Specify additional SQL to be appended to schema string.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
                                                        <tr class="inherited" id="canGetProperty()">
        <td><a href="yii-base-object.html#canGetProperty()-detail">canGetProperty()</a></td>
        <td>Returns a value indicating whether a property can be read.</td>
        <td><a href="yii-base-object.html">yii\base\Object</a></td>
    </tr>
            <tr class="inherited" id="canSetProperty()">
        <td><a href="yii-base-object.html#canSetProperty()-detail">canSetProperty()</a></td>
        <td>Returns a value indicating whether a property can be set.</td>
        <td><a href="yii-base-object.html">yii\base\Object</a></td>
    </tr>
            <tr id="check()">
        <td><a href="yii-db-columnschemabuilder.html#check()-detail">check()</a></td>
        <td>Sets a <code>CHECK</code> constraint for the column.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
            <tr class="inherited" id="className()">
        <td><a href="yii-base-object.html#className()-detail">className()</a></td>
        <td>Returns the fully qualified name of this class.</td>
        <td><a href="yii-base-object.html">yii\base\Object</a></td>
    </tr>
            <tr id="comment()">
        <td><a href="yii-db-columnschemabuilder.html#comment()-detail">comment()</a></td>
        <td>Specifies the comment for column.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
            <tr id="defaultExpression()">
        <td><a href="yii-db-columnschemabuilder.html#defaultExpression()-detail">defaultExpression()</a></td>
        <td>Specify the default SQL expression for the column.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
            <tr id="defaultValue()">
        <td><a href="yii-db-columnschemabuilder.html#defaultValue()-detail">defaultValue()</a></td>
        <td>Specify the default value for the column.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
            <tr id="first()">
        <td><a href="yii-db-columnschemabuilder.html#first()-detail">first()</a></td>
        <td>Adds an <code>FIRST</code> constraint to the column.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
                <tr class="inherited" id="hasMethod()">
        <td><a href="yii-base-object.html#hasMethod()-detail">hasMethod()</a></td>
        <td>Returns a value indicating whether a method is defined.</td>
        <td><a href="yii-base-object.html">yii\base\Object</a></td>
    </tr>
            <tr class="inherited" id="hasProperty()">
        <td><a href="yii-base-object.html#hasProperty()-detail">hasProperty()</a></td>
        <td>Returns a value indicating whether a property is defined.</td>
        <td><a href="yii-base-object.html">yii\base\Object</a></td>
    </tr>
            <tr class="inherited" id="init()">
        <td><a href="yii-base-object.html#init()-detail">init()</a></td>
        <td>Initializes the object.</td>
        <td><a href="yii-base-object.html">yii\base\Object</a></td>
    </tr>
            <tr id="notNull()">
        <td><a href="yii-db-columnschemabuilder.html#notNull()-detail">notNull()</a></td>
        <td>Adds a <code>NOT NULL</code> constraint to the column.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
            <tr id="null()">
        <td><a href="yii-db-columnschemabuilder.html#null()-detail">null()</a></td>
        <td>Adds a <code>NULL</code> constraint to the column</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
            <tr id="unique()">
        <td><a href="yii-db-columnschemabuilder.html#unique()-detail">unique()</a></td>
        <td>Adds a <code>UNIQUE</code> constraint to the column.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
            <tr id="unsigned()">
        <td><a href="yii-db-columnschemabuilder.html#unsigned()-detail">unsigned()</a></td>
        <td>Marks column as unsigned.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
    </table>
</div>

<div class="summary doc-method">
<h2>Protected Methods</h2>

<p><a href="#" class="toggle">Hide inherited methods</a></p>

<table class="summary-table table table-striped table-bordered table-hover">
<colgroup>
    <col class="col-method" />
    <col class="col-description" />
    <col class="col-defined" />
</colgroup>
<tr>
  <th>Method</th><th>Description</th><th>Defined By</th>
</tr>
                                            <tr id="buildAfterString()">
        <td><a href="yii-db-columnschemabuilder.html#buildAfterString()-detail">buildAfterString()</a></td>
        <td>Builds the after constraint for the column. Defaults to unsupported.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
            <tr id="buildAppendString()">
        <td><a href="yii-db-columnschemabuilder.html#buildAppendString()-detail">buildAppendString()</a></td>
        <td>Builds the custom string that's appended to column definition.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
            <tr id="buildCheckString()">
        <td><a href="yii-db-columnschemabuilder.html#buildCheckString()-detail">buildCheckString()</a></td>
        <td>Builds the check constraint for the column.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
            <tr id="buildCommentString()">
        <td><a href="yii-db-columnschemabuilder.html#buildCommentString()-detail">buildCommentString()</a></td>
        <td>Builds the comment specification for the column.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
            <tr id="buildCompleteString()">
        <td><a href="yii-db-columnschemabuilder.html#buildCompleteString()-detail">buildCompleteString()</a></td>
        <td>Returns the complete column definition from input format</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
            <tr id="buildDefaultString()">
        <td><a href="yii-db-columnschemabuilder.html#buildDefaultString()-detail">buildDefaultString()</a></td>
        <td>Builds the default value specification for the column.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
            <tr id="buildFirstString()">
        <td><a href="yii-db-columnschemabuilder.html#buildFirstString()-detail">buildFirstString()</a></td>
        <td>Builds the first constraint for the column. Defaults to unsupported.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
            <tr id="buildLengthString()">
        <td><a href="yii-db-columnschemabuilder.html#buildLengthString()-detail">buildLengthString()</a></td>
        <td>Builds the length/precision part of the column.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
            <tr id="buildNotNullString()">
        <td><a href="yii-db-columnschemabuilder.html#buildNotNullString()-detail">buildNotNullString()</a></td>
        <td>Builds the not null constraint for the column.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
            <tr id="buildUniqueString()">
        <td><a href="yii-db-columnschemabuilder.html#buildUniqueString()-detail">buildUniqueString()</a></td>
        <td>Builds the unique constraint for the column.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
            <tr id="buildUnsignedString()">
        <td><a href="yii-db-columnschemabuilder.html#buildUnsignedString()-detail">buildUnsignedString()</a></td>
        <td>Builds the unsigned string for column. Defaults to unsupported.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
                                            <tr id="getTypeCategory()">
        <td><a href="yii-db-columnschemabuilder.html#getTypeCategory()-detail">getTypeCategory()</a></td>
        <td>Returns the category of the column type.</td>
        <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
    </tr>
                                </table>
</div>

<a id="events"></a>

<a id="constants"></a>
<div class="summary doc-const">
    <h2>Constants</h2>

    <p><a href="#" class="toggle">Hide inherited constants</a></p>

    <table class="summary-table table table-striped table-bordered table-hover">
    <colgroup>
        <col class="col-const" />
        <col class="col-value" />
        <col class="col-description" />
        <col class="col-defined" />
    </colgroup>
    <tr>
        <th>Constant</th><th>Value</th><th>Description</th><th>Defined By</th>
    </tr>
            <tr id="CATEGORY_NUMERIC">
          <td id="CATEGORY_NUMERIC-detail">CATEGORY_NUMERIC</td>
          <td>'numeric'</td>
          <td>
</td>
          <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
        </tr>
            <tr id="CATEGORY_OTHER">
          <td id="CATEGORY_OTHER-detail">CATEGORY_OTHER</td>
          <td>'other'</td>
          <td>
</td>
          <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
        </tr>
            <tr id="CATEGORY_PK">
          <td id="CATEGORY_PK-detail">CATEGORY_PK</td>
          <td>'pk'</td>
          <td>
</td>
          <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
        </tr>
            <tr id="CATEGORY_STRING">
          <td id="CATEGORY_STRING-detail">CATEGORY_STRING</td>
          <td>'string'</td>
          <td>
</td>
          <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
        </tr>
            <tr id="CATEGORY_TIME">
          <td id="CATEGORY_TIME-detail">CATEGORY_TIME</td>
          <td>'time'</td>
          <td>
</td>
          <td><a href="yii-db-columnschemabuilder.html">yii\db\ColumnSchemaBuilder</a></td>
        </tr>
        </table>
</div>

<h2>Property Details</h2>

<div class="property-doc">

    <div class="detail-header h3" id="$after-detail">
        <a href="#" class="tool-link" title="go to top"><span class="glyphicon glyphicon-arrow-up"></span></a>
        <a class="tool-link hash" href="yii-db-columnschemabuilder.html#$after-detail" title="direct link to this method"><span class="glyphicon icon-hash"></span></a>
                    <a href="https://github.com/yiisoft/yii2/edit/master/framework/db/ColumnSchemaBuilder.php#L73" class="tool-link" title="edit on github"><span class="glyphicon glyphicon-pencil"></span></a>
            <a href="https://github.com/yiisoft/yii2/blob/master/framework/db/ColumnSchemaBuilder.php#L73" class="tool-link" title="view source on github"><span class="glyphicon glyphicon-eye-open"></span></a>
        
        $after        <span class="detail-header-tag small">
            protected                                                property
                            (available since version 2.0.8)
                    </span>
    </div>

    <div class="doc-description">
        <p>The column after which this column will be added.</p>

            </div>

    <div class="signature"><span class="signature-defs">protected</span> <span class="signature-type"><a href="http://www.php.net/language.types.string">string</a></span> <a href="yii-db-columnschemabuilder.html#$after-detail">$after</a> <span style="color: #0000BB"></span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">null</span></div>


    <div class="detail-header h3" id="$append-detail">
        <a href="#" class="tool-link" title="go to top"><span class="glyphicon glyphicon-arrow-up"></span></a>
        <a class="tool-link hash" href="yii-db-columnschemabuilder.html#$append-detail" title="direct link to this method"><span class="glyphicon icon-hash"></span></a>
                    <a href="https://github.com/yiisoft/yii2/edit/master/framework/db/ColumnSchemaBuilder.php#L63" class="tool-link" title="edit on github"><span class="glyphicon glyphicon-pencil"></span></a>
            <a href="https://github.com/yiisoft/yii2/blob/master/framework/db/ColumnSchemaBuilder.php#L63" class="tool-link" title="view source on github"><span class="glyphicon glyphicon-eye-open"></span></a>
        
        $append        <span class="detail-header-tag small">
            protected                                                property
                            (available since version 2.0.9)
                    </span>
    </div>

    <div class="doc-description">
        <p>SQL string to be appended to column schema definition.</p>

            </div>

    <div class="signature"><span class="signature-defs">protected</span> <span class="signature-type">mixed</span> <a href="yii-db-columnschemabuilder.html#$append-detail">$append</a> <span style="color: #0000BB"></span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">null</span></div>


    <div class="detail-header h3" id="$categoryMap-detail">
        <a href="#" class="tool-link" title="go to top"><span class="glyphicon glyphicon-arrow-up"></span></a>
        <a class="tool-link hash" href="yii-db-columnschemabuilder.html#$categoryMap-detail" title="direct link to this method"><span class="glyphicon icon-hash"></span></a>
                    <a href="https://github.com/yiisoft/yii2/edit/master/framework/db/ColumnSchemaBuilder.php#L84" class="tool-link" title="edit on github"><span class="glyphicon glyphicon-pencil"></span></a>
            <a href="https://github.com/yiisoft/yii2/blob/master/framework/db/ColumnSchemaBuilder.php#L84" class="tool-link" title="view source on github"><span class="glyphicon glyphicon-eye-open"></span></a>
        
        $categoryMap        <span class="detail-header-tag small">
            public                                                property
                            (available since version 2.0.8)
                    </span>
    </div>

    <div class="doc-description">
        <p>Mapping of abstract column types (keys) to type categories (values).</p>

            </div>

    <div class="signature"><span class="signature-defs">public</span> <span class="signature-type"><a href="http://www.php.net/language.types.array">array</a></span> <a href="yii-db-columnschemabuilder.html#$categoryMap-detail">$categoryMap</a> <span style="color: #0000BB"></span><span style="color: #007700">=&nbsp;[\</span><span style="color: #0000BB">yii</span><span style="color: #007700">\</span><span style="color: #0000BB">db</span><span style="color: #007700">\</span><span style="color: #0000BB">Schema</span><span style="color: #007700">::</span><span style="color: #0000BB">TYPE_PK&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">self</span><span style="color: #007700">::</span><span style="color: #0000BB">CATEGORY_PK</span><span style="color: #007700">,&nbsp;\</span><span style="color: #0000BB">yii</span><span style="color: #007700">\</span><span style="color: #0000BB">db</span><span style="color: #007700">\</span><span style="color: #0000BB">Schema</span><span style="color: #007700">::</span><span style="color: #0000BB">TYPE_UPK&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">self</span><span style="color: #007700">::</span><span style="color: #0000BB">CATEGORY_PK</span><span style="color: #007700">,&nbsp;\</span><span style="color: #0000BB">yii</span><span style="color: #007700">\</span><span style="color: #0000BB">db</span><span style="color: #007700">\</span><span style="color: #0000BB">Schema</span><span style="color: #007700">::</span><span style="color: #0000BB">TYPE_BIGPK&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">self</span><span style="color: #007700">::</span><span style="color: #0000BB">CATEGORY_PK</span><span style="color: #007700">,&nbsp;\</span><span style="color: #0000BB">yii</span><span style="color: #007700">\</span><span style="color: #0000BB">db</span><span style="color: #007700">\</span><span style="color: #0000BB">Schema</span><span style="color: #007700">::</span><span style="color: #0000BB">TYPE_UBIGPK&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">self</span><span style="color: #007700">::</span><span style="color: #0000BB">CATEGORY_PK</span><span style="color: #007700">,&nbsp;\</span><span style="color: #0000BB">yii</span><span style="color: #007700">\</span><span style="color: #0000BB">db</span><span style="color: #007700">\</span><span style="color: #0000BB">Schema</span><span style="color: #007700">::</span><span style="color: #0000BB">TYPE_CHAR&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">self</span><span style="color: #007700">::</span><span style="color: #0000BB">CATEGORY_STRING</span><span style="color: #007700">,&nbsp;\</span><span style="color: #0000BB">yii</span><span style="color: #007700">\</span><span style="color: #0000BB">db</span><span style="color: #007700">\</span><span style="color: #0000BB">Schema</span><span style="color: #007700">::</span><span style="color: #0000BB">TYPE_STRING&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">self</span><span style="color: #007700">::</span><span style="color: #0000BB">CATEGORY_STRING</span><span style="color: #007700">,&nbsp;\</span><span style="color: #0000BB">yii</span><span style="color: #007700">\</span><span style="color: #0000BB">db</span><span style="color: #007700">\</span><span style="color: #0000BB">Schema</span><span style="color: #007700">::</span><span style="color: #0000BB">TYPE_TEXT&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">self</span><span style="color: #007700">::</span><span style="color: #0000BB">CATEGORY_STRING</span><span style="color: #007700">,&nbsp;\</span><span style="color: #0000BB">yii</span><span style="color: #007700">\</span><span style="color: #0000BB">db</span><span style="color: #007700">\</span><span style="color: #0000BB">Schema</span><span style="color: #007700">::</span><span style="color: #0000BB">TYPE_SMALLINT&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">self</span><span style="color: #007700">::</span><span style="color: #0000BB">CATEGORY_NUMERIC</span><span style="color: #007700">,&nbsp;\</span><span style="color: #0000BB">yii</span><span style="color: #007700">\</span><span style="color: #0000BB">db</span><span style="color: #007700">\</span><span style="color: #0000BB">Schema</span><span style="color: #007700">::</span><span style="color: #0000BB">TYPE_INTEGER&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">self</span><span style="color: #007700">::</span><span style="color: #0000BB">CATEGORY_NUMERIC</span><span style="color: #007700">,&nbsp;\</span><span style="color: #0000BB">yii</span><span style="color: #007700">\</span><span style="color: #0000BB">db</span><span style="color: #007700">\</span><span style="color: #0000BB">Schema</span><span style="color: #007700">::</span><span style="color: #0000BB">TYPE_BIGINT&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">self</span><span style="color: #007700">::</span><span style="color: #0000BB">CATEGORY_NUMERIC</span><span style="color: #007700">,&nbsp;\</span><span style="color: #0000BB">yii</span><span style="color: #007700">\</span><span style="color: #0000BB">db</span><span style="color: #007700">\</span><span style="color: #0000BB">Schema</span><span style="color: #007700">::</span><span style="color: #0000BB">TYPE_FLOAT&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">self</span><span style="color: #007700">::</span><span style="color: #0000BB">CATEGORY_NUMERIC</span><span style="color: #007700">,&nbsp;\</span><span style="color: #0000BB">yii</span><span style="color: #007700">\</span><span style="color: #0000BB">db</span><span style="color: #007700">\</span><span style="color: #0000BB">Schema</span><span style="color: #007700">::</span><span style="color: #0000BB">TYPE_DOUBLE&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">self</span><span style="color: #007700">::</span><span style="color: #0000BB">CATEGORY_NUMERIC</span><span style="color: #007700">,&nbsp;\</span><span style="color: #0000BB">yii</span><span style="color: #007700">\</span><span style="color: #0000BB">db</span><span style="color: #007700">\</span><span style="color: #0000BB">Schema</span><span style="color: #007700">::</span><span style="color: #0000BB">TYPE_DECIMAL&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">self</span><span style="color: #007700">::</span><span style="color: #0000BB">CATEGORY_NUMERIC</span><span style="color: #007700">,&nbsp;\</span><span style="color: #0000BB">yii</span><span style="color: #007700">\</span><span style="color: #0000BB">db</span><span style="color: #007700">\</span><span style="color: #0000BB">Schema</span><span style="color: #007700">::</span><span style="color: #0000BB">TYPE_DATETIME&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">self</span><span style="color: #007700">::</span><span style="color: #0000BB">CATEGORY_TIME</span><span style="color: #007700">,&nbsp;\</span><span style="color: #0000BB">yii</span><span style="color: #007700">\</span><span style="color: #0000BB">db</span><span style="color: #007700">\</span><span style="color: #0000BB">Schema</span><span style="color: #007700">::</span><span style="color: #0000BB">TYPE_TIMESTAMP&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">self</span><span style="color: #007700">::</span><span style="color: #0000BB">CATEGORY_TIME</span><span style="color: #007700">,&nbsp;\</span><span style="color: #0000BB">yii</span><span style="color: #007700">\</span><span style="color: #0000BB">db</span><span style="color: #007700">\</span><span style="color: #0000BB">Schema</span><span style="color: #007700">::</span><span style="color: #0000BB">TYPE_TIME&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">self</span><span style="color: #007700">::</span><span style="color: #0000BB">CATEGORY_TIME</span><span style="color: #007700">,&nbsp;\</span><span style="color: #0000BB">yii</span><span style="color: #007700">\</span><span style="color: #0000BB">db</span><span style="color: #007700">\</span><span style="color: #0000BB">Schema</span><span style="color: #007700">::</span><span style="color: #0000BB">TYPE_DATE&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">self</span><span style="color: #007700">::</span><span style="color: #0000BB">CATEGORY_TIME</span><span style="color: #007700">,&nbsp;\</span><span style="color: #0000BB">yii</span><span style="color: #007700">\</span><span style="color: #0000BB">db</span><span style="color: #007700">\</span><span style="color: #0000BB">Schema</span><span style="color: #007700">::</span><span style="color: #0000BB">TYPE_BINARY&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">self</span><span style="color: #007700">::</span><span style="color: #0000BB">CATEGORY_OTHER</span><span style="color: #007700">,&nbsp;\</span><span style="color: #0000BB">yii</span><span style="color: #007700">\</span><span style="color: #0000BB">db</span><span style="color: #007700">\</span><span style="color: #0000BB">Schema</span><span style="color: #007700">::</span><span style="color: #0000BB">TYPE_BOOLEAN&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">self</span><span style="color: #007700">::</span><span style="color: #0000BB">CATEGORY_NUMERIC</span><span style="color: #007700">,&nbsp;\</span><span style="color: #0000BB">yii</span><span style="color: #007700">\</span><span style="color: #0000BB">db</span><span style="color: #007700">\</span><span style="color: #0000BB">Schema</span><span style="color: #007700">::</span><span style="color: #0000BB">TYPE_MONEY&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">self</span><span style="color: #007700">::</span><span style="color: #0000BB">CATEGORY_NUMERIC</span><span style="color: #007700">]</span></div>


    <div class="detail-header h3" id="$check-detail">
        <a href="#" class="tool-link" title="go to top"><span class="glyphicon glyphicon-arrow-up"></span></a>
        <a class="tool-link hash" href="yii-db-columnschemabuilder.html#$check-detail" title="direct link to this method"><span class="glyphicon icon-hash"></span></a>
                    <a href="https://github.com/yiisoft/yii2/edit/master/framework/db/ColumnSchemaBuilder.php#L54" class="tool-link" title="edit on github"><span class="glyphicon glyphicon-pencil"></span></a>
            <a href="https://github.com/yiisoft/yii2/blob/master/framework/db/ColumnSchemaBuilder.php#L54" class="tool-link" title="view source on github"><span class="glyphicon glyphicon-eye-open"></span></a>
        
        $check        <span class="detail-header-tag small">
            protected                                                property
                    </span>
    </div>

    <div class="doc-description">
        <p>The <code>CHECK</code> constraint for the column.</p>

            </div>

    <div class="signature"><span class="signature-defs">protected</span> <span class="signature-type"><a href="http://www.php.net/language.types.string">string</a></span> <a href="yii-db-columnschemabuilder.html#$check-detail">$check</a> <span style="color: #0000BB"></span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">null</span></div>


    <div class="detail-header h3" id="$comment-detail">
        <a href="#" class="tool-link" title="go to top"><span class="glyphicon glyphicon-arrow-up"></span></a>
        <a class="tool-link hash" href="yii-db-columnschemabuilder.html#$comment-detail" title="direct link to this method"><span class="glyphicon icon-hash"></span></a>
                    <a href="https://github.com/yiisoft/yii2/edit/master/framework/db/ColumnSchemaBuilder.php#L116" class="tool-link" title="edit on github"><span class="glyphicon glyphicon-pencil"></span></a>
            <a href="https://github.com/yiisoft/yii2/blob/master/framework/db/ColumnSchemaBuilder.php#L116" class="tool-link" title="view source on github"><span class="glyphicon glyphicon-eye-open"></span></a>
        
        $comment        <span class="detail-header-tag small">
            public                                                property
                            (available since version 2.0.8)
                    </span>
    </div>

    <div class="doc-description">
        <p>Comment value of the column.</p>

            </div>

    <div class="signature"><span class="signature-defs">public</span> <span class="signature-type"><a href="http://www.php.net/language.types.string">string</a></span> <a href="yii-db-columnschemabuilder.html#$comment-detail">$comment</a> <span style="color: #0000BB"></span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">null</span></div>


    <div class="detail-header h3" id="$db-detail">
        <a href="#" class="tool-link" title="go to top"><span class="glyphicon glyphicon-arrow-up"></span></a>
        <a class="tool-link hash" href="yii-db-columnschemabuilder.html#$db-detail" title="direct link to this method"><span class="glyphicon icon-hash"></span></a>
                    <a href="https://github.com/yiisoft/yii2/edit/master/framework/db/ColumnSchemaBuilder.php#L111" class="tool-link" title="edit on github"><span class="glyphicon glyphicon-pencil"></span></a>
            <a href="https://github.com/yiisoft/yii2/blob/master/framework/db/ColumnSchemaBuilder.php#L111" class="tool-link" title="view source on github"><span class="glyphicon glyphicon-eye-open"></span></a>
        
        $db        <span class="detail-header-tag small">
            public                                                property
                            (available since version 2.0.8)
                    </span>
    </div>

    <div class="doc-description">
        <p>The current database connection. It is used mainly to escape strings
safely when building the final column schema string.</p>

            </div>

    <div class="signature"><span class="signature-defs">public</span> <span class="signature-type"><a href="yii-db-connection.html">yii\db\Connection</a></span> <a href="yii-db-columnschemabuilder.html#$db-detail">$db</a> <span style="color: #0000BB"></span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">null</span></div>


    <div class="detail-header h3" id="$default-detail">
        <a href="#" class="tool-link" title="go to top"><span class="glyphicon glyphicon-arrow-up"></span></a>
        <a class="tool-link hash" href="yii-db-columnschemabuilder.html#$default-detail" title="direct link to this method"><span class="glyphicon icon-hash"></span></a>
                    <a href="https://github.com/yiisoft/yii2/edit/master/framework/db/ColumnSchemaBuilder.php#L58" class="tool-link" title="edit on github"><span class="glyphicon glyphicon-pencil"></span></a>
            <a href="https://github.com/yiisoft/yii2/blob/master/framework/db/ColumnSchemaBuilder.php#L58" class="tool-link" title="view source on github"><span class="glyphicon glyphicon-eye-open"></span></a>
        
        $default        <span class="detail-header-tag small">
            protected                                                property
                    </span>
    </div>

    <div class="doc-description">
        <p>Default value of the column.</p>

            </div>

    <div class="signature"><span class="signature-defs">protected</span> <span class="signature-type">mixed</span> <a href="yii-db-columnschemabuilder.html#$default-detail">$default</a> <span style="color: #0000BB"></span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">null</span></div>


    <div class="detail-header h3" id="$isFirst-detail">
        <a href="#" class="tool-link" title="go to top"><span class="glyphicon glyphicon-arrow-up"></span></a>
        <a class="tool-link hash" href="yii-db-columnschemabuilder.html#$isFirst-detail" title="direct link to this method"><span class="glyphicon icon-hash"></span></a>
                    <a href="https://github.com/yiisoft/yii2/edit/master/framework/db/ColumnSchemaBuilder.php#L78" class="tool-link" title="edit on github"><span class="glyphicon glyphicon-pencil"></span></a>
            <a href="https://github.com/yiisoft/yii2/blob/master/framework/db/ColumnSchemaBuilder.php#L78" class="tool-link" title="view source on github"><span class="glyphicon glyphicon-eye-open"></span></a>
        
        $isFirst        <span class="detail-header-tag small">
            protected                                                property
                            (available since version 2.0.8)
                    </span>
    </div>

    <div class="doc-description">
        <p>Whether this column is to be inserted at the beginning of the table.</p>

            </div>

    <div class="signature"><span class="signature-defs">protected</span> <span class="signature-type"><a href="http://www.php.net/language.types.boolean">boolean</a></span> <a href="yii-db-columnschemabuilder.html#$isFirst-detail">$isFirst</a> <span style="color: #0000BB"></span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">null</span></div>


    <div class="detail-header h3" id="$isNotNull-detail">
        <a href="#" class="tool-link" title="go to top"><span class="glyphicon glyphicon-arrow-up"></span></a>
        <a class="tool-link hash" href="yii-db-columnschemabuilder.html#$isNotNull-detail" title="direct link to this method"><span class="glyphicon icon-hash"></span></a>
                    <a href="https://github.com/yiisoft/yii2/edit/master/framework/db/ColumnSchemaBuilder.php#L46" class="tool-link" title="edit on github"><span class="glyphicon glyphicon-pencil"></span></a>
            <a href="https://github.com/yiisoft/yii2/blob/master/framework/db/ColumnSchemaBuilder.php#L46" class="tool-link" title="view source on github"><span class="glyphicon glyphicon-eye-open"></span></a>
        
        $isNotNull        <span class="detail-header-tag small">
            protected                                                property
                    </span>
    </div>

    <div class="doc-description">
        <p>Whether the column is or not nullable. If this is <code>true</code>, a <code>NOT NULL</code> constraint will be added.
If this is <code>false</code>, a <code>NULL</code> constraint will be added.</p>

            </div>

    <div class="signature"><span class="signature-defs">protected</span> <span class="signature-type"><a href="http://www.php.net/language.types.boolean">boolean</a>|<a href="http://www.php.net/language.types.null">null</a></span> <a href="yii-db-columnschemabuilder.html#$isNotNull-detail">$isNotNull</a> <span style="color: #0000BB"></span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">null</span></div>


    <div class="detail-header h3" id="$isUnique-detail">
        <a href="#" class="tool-link" title="go to top"><span class="glyphicon glyphicon-arrow-up"></span></a>
        <a class="tool-link hash" href="yii-db-columnschemabuilder.html#$isUnique-detail" title="direct link to this method"><span class="glyphicon icon-hash"></span></a>
                    <a href="https://github.com/yiisoft/yii2/edit/master/framework/db/ColumnSchemaBuilder.php#L50" class="tool-link" title="edit on github"><span class="glyphicon glyphicon-pencil"></span></a>
            <a href="https://github.com/yiisoft/yii2/blob/master/framework/db/ColumnSchemaBuilder.php#L50" class="tool-link" title="view source on github"><span class="glyphicon glyphicon-eye-open"></span></a>
        
        $isUnique        <span class="detail-header-tag small">
            protected                                                property
                    </span>
    </div>

    <div class="doc-description">
        <p>Whether the column values should be unique. If this is <code>true</code>, a <code>UNIQUE</code> constraint will be added.</p>

            </div>

    <div class="signature"><span class="signature-defs">protected</span> <span class="signature-type"><a href="http://www.php.net/language.types.boolean">boolean</a></span> <a href="yii-db-columnschemabuilder.html#$isUnique-detail">$isUnique</a> <span style="color: #0000BB"></span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">false</span></div>


    <div class="detail-header h3" id="$isUnsigned-detail">
        <a href="#" class="tool-link" title="go to top"><span class="glyphicon glyphicon-arrow-up"></span></a>
        <a class="tool-link hash" href="yii-db-columnschemabuilder.html#$isUnsigned-detail" title="direct link to this method"><span class="glyphicon icon-hash"></span></a>
                    <a href="https://github.com/yiisoft/yii2/edit/master/framework/db/ColumnSchemaBuilder.php#L68" class="tool-link" title="edit on github"><span class="glyphicon glyphicon-pencil"></span></a>
            <a href="https://github.com/yiisoft/yii2/blob/master/framework/db/ColumnSchemaBuilder.php#L68" class="tool-link" title="view source on github"><span class="glyphicon glyphicon-eye-open"></span></a>
        
        $isUnsigned        <span class="detail-header-tag small">
            protected                                                property
                            (available since version 2.0.7)
                    </span>
    </div>

    <div class="doc-description">
        <p>Whether the column values should be unsigned. If this is <code>true</code>, an <code>UNSIGNED</code> keyword will be added.</p>

            </div>

    <div class="signature"><span class="signature-defs">protected</span> <span class="signature-type"><a href="http://www.php.net/language.types.boolean">boolean</a></span> <a href="yii-db-columnschemabuilder.html#$isUnsigned-detail">$isUnsigned</a> <span style="color: #0000BB"></span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">false</span></div>


    <div class="detail-header h3" id="$length-detail">
        <a href="#" class="tool-link" title="go to top"><span class="glyphicon glyphicon-arrow-up"></span></a>
        <a class="tool-link hash" href="yii-db-columnschemabuilder.html#$length-detail" title="direct link to this method"><span class="glyphicon icon-hash"></span></a>
                    <a href="https://github.com/yiisoft/yii2/edit/master/framework/db/ColumnSchemaBuilder.php#L41" class="tool-link" title="edit on github"><span class="glyphicon glyphicon-pencil"></span></a>
            <a href="https://github.com/yiisoft/yii2/blob/master/framework/db/ColumnSchemaBuilder.php#L41" class="tool-link" title="view source on github"><span class="glyphicon glyphicon-eye-open"></span></a>
        
        $length        <span class="detail-header-tag small">
            protected                                                property
                    </span>
    </div>

    <div class="doc-description">
        <p>Column size or precision definition. This is what goes into the parenthesis after
the column type. This can be either a string, an integer or an array. If it is an array, the array values will
be joined into a string separated by comma.</p>

            </div>

    <div class="signature"><span class="signature-defs">protected</span> <span class="signature-type"><a href="http://www.php.net/language.types.integer">integer</a>|<a href="http://www.php.net/language.types.string">string</a>|<a href="http://www.php.net/language.types.array">array</a></span> <a href="yii-db-columnschemabuilder.html#$length-detail">$length</a> <span style="color: #0000BB"></span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">null</span></div>


    <div class="detail-header h3" id="$type-detail">
        <a href="#" class="tool-link" title="go to top"><span class="glyphicon glyphicon-arrow-up"></span></a>
        <a class="tool-link hash" href="yii-db-columnschemabuilder.html#$type-detail" title="direct link to this method"><span class="glyphicon icon-hash"></span></a>
                    <a href="https://github.com/yiisoft/yii2/edit/master/framework/db/ColumnSchemaBuilder.php#L35" class="tool-link" title="edit on github"><span class="glyphicon glyphicon-pencil"></span></a>
            <a href="https://github.com/yiisoft/yii2/blob/master/framework/db/ColumnSchemaBuilder.php#L35" class="tool-link" title="view source on github"><span class="glyphicon glyphicon-eye-open"></span></a>
        
        $type        <span class="detail-header-tag small">
            protected                                                property
                    </span>
    </div>

    <div class="doc-description">
        <p>The column type definition such as INTEGER, VARCHAR, DATETIME, etc.</p>

            </div>

    <div class="signature"><span class="signature-defs">protected</span> <span class="signature-type"><a href="http://www.php.net/language.types.string">string</a></span> <a href="yii-db-columnschemabuilder.html#$type-detail">$type</a> <span style="color: #0000BB"></span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">null</span></div>

</div>
<h2>Method Details</h2>

<div class="method-doc">

    <div class="detail-header h3" id="__construct()-detail">
        <a href="#" class="tool-link" title="go to top"><span class="glyphicon glyphicon-arrow-up"></span></a>
        <a class="tool-link hash" href="yii-db-columnschemabuilder.html#__construct()-detail" title="direct link to this method"><span class="glyphicon icon-hash"></span></a>
                    <a href="https://github.com/yiisoft/yii2/edit/master/framework/db/ColumnSchemaBuilder.php#L126" class="tool-link" title="edit on github"><span class="glyphicon glyphicon-pencil"></span></a>
            <a href="https://github.com/yiisoft/yii2/blob/master/framework/db/ColumnSchemaBuilder.php#L126" class="tool-link" title="view source on github"><span class="glyphicon glyphicon-eye-open"></span></a>
        
        __construct()
        <span class="detail-header-tag small">
            public                                    method
                    </span>
    </div>

    <div class="doc-description">
        <p><strong>Create a column schema builder instance giving the type and value precision.</strong></p>

        
            </div>

    <table class="detail-table table table-striped table-bordered table-hover">
        <tr><td colspan="3" class="signature"><span class="signature-defs">public</span> <span class="signature-type">void</span> <strong><a href="yii-db-columnschemabuilder.html#__construct()-detail">__construct</a></strong> ( <span style="color: #0000BB">$type</span>, <span style="color: #0000BB">$length&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">null</span>, <span style="color: #0000BB">$db&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">null</span>, <span style="color: #0000BB">$config&nbsp;</span><span style="color: #007700">=&nbsp;[]</span> )</td></tr>
                                    <tr>
                  <td class="param-name-col"><span style="color: #0000BB">$type</span></td>
                  <td class="param-type-col"><a href="http://www.php.net/language.types.string">string</a></td>
                  <td class="param-desc-col"><p>Type of the column. See <a href="yii-db-columnschemabuilder.html#$type-detail">$type</a>.</p>
</td>
                </tr>
                            <tr>
                  <td class="param-name-col"><span style="color: #0000BB">$length</span></td>
                  <td class="param-type-col"><a href="http://www.php.net/language.types.integer">integer</a>|<a href="http://www.php.net/language.types.string">string</a>|<a href="http://www.php.net/language.types.array">array</a></td>
                  <td class="param-desc-col"><p>Length or precision of the column. See <a href="yii-db-columnschemabuilder.html#$length-detail">$length</a>.</p>
</td>
                </tr>
                            <tr>
                  <td class="param-name-col"><span style="color: #0000BB">$db</span></td>
                  <td class="param-type-col"><a href="yii-db-connection.html">yii\db\Connection</a></td>
                  <td class="param-desc-col"><p>The current database connection. See <a href="yii-db-columnschemabuilder.html#$db-detail">$db</a>.</p>
</td>
                </tr>
                            <tr>
                  <td class="param-name-col"><span style="color: #0000BB">$config</span></td>
                  <td class="param-type-col"><a href="http://www.php.net/language.types.array">array</a></td>
                  <td class="param-desc-col"><p>Name-value pairs that will be used to initialize the object properties</p>
</td>
                </tr>
                                                </table>

<!--	-->

    <div class="detail-header h3" id="__toString()-detail">
        <a href="#" class="tool-link" title="go to top"><span class="glyphicon glyphicon-arrow-up"></span></a>
        <a class="tool-link hash" href="yii-db-columnschemabuilder.html#__toString()-detail" title="direct link to this method"><span class="glyphicon icon-hash"></span></a>
                    <a href="https://github.com/yiisoft/yii2/edit/master/framework/db/ColumnSchemaBuilder.php#L275" class="tool-link" title="edit on github"><span class="glyphicon glyphicon-pencil"></span></a>
            <a href="https://github.com/yiisoft/yii2/blob/master/framework/db/ColumnSchemaBuilder.php#L275" class="tool-link" title="view source on github"><span class="glyphicon glyphicon-eye-open"></span></a>
        
        __toString()
        <span class="detail-header-tag small">
            public                                    method
                    </span>
    </div>

    <div class="doc-description">
        <p><strong>Builds the full string for the column's schema</strong></p>

        
            </div>

    <table class="detail-table table table-striped table-bordered table-hover">
        <tr><td colspan="3" class="signature"><span class="signature-defs">public</span> <span class="signature-type"><a href="http://www.php.net/language.types.string">string</a></span> <strong><a href="yii-db-columnschemabuilder.html#__toString()-detail">__toString</a></strong> ( )</td></tr>
            </table>

<!--	-->

    <div class="detail-header h3" id="after()-detail">
        <a href="#" class="tool-link" title="go to top"><span class="glyphicon glyphicon-arrow-up"></span></a>
        <a class="tool-link hash" href="yii-db-columnschemabuilder.html#after()-detail" title="direct link to this method"><span class="glyphicon icon-hash"></span></a>
                    <a href="https://github.com/yiisoft/yii2/edit/master/framework/db/ColumnSchemaBuilder.php#L229" class="tool-link" title="edit on github"><span class="glyphicon glyphicon-pencil"></span></a>
            <a href="https://github.com/yiisoft/yii2/blob/master/framework/db/ColumnSchemaBuilder.php#L229" class="tool-link" title="view source on github"><span class="glyphicon glyphicon-eye-open"></span></a>
        
        after()
        <span class="detail-header-tag small">
            public                                    method
                            (available since version 2.0.8)
                    </span>
    </div>

    <div class="doc-description">
        <p><strong>Adds an <code>AFTER</code> constraint to the column.</strong></p>

        <p>Note: MySQL, Oracle and Cubrid support only.</p>

            </div>

    <table class="detail-table table table-striped table-bordered table-hover">
        <tr><td colspan="3" class="signature"><span class="signature-defs">public</span> <span class="signature-type"><a href="yii-db-columnschemabuilder.html">$this</a></span> <strong><a href="yii-db-columnschemabuilder.html#after()-detail">after</a></strong> ( <span style="color: #0000BB">$after</span> )</td></tr>
                                    <tr>
                  <td class="param-name-col"><span style="color: #0000BB">$after</span></td>
                  <td class="param-type-col"><a href="http://www.php.net/language.types.string">string</a></td>
                  <td class="param-desc-col"><p>The column after which $this column will be added.</p>
</td>
                </tr>
                                                </table>

<!--	-->

    <div class="detail-header h3" id="append()-detail">
        <a href="#" class="tool-link" title="go to top"><span class="glyphicon glyphicon-arrow-up"></span></a>
        <a class="tool-link hash" href="yii-db-columnschemabuilder.html#append()-detail" title="direct link to this method"><span class="glyphicon icon-hash"></span></a>
                    <a href="https://github.com/yiisoft/yii2/edit/master/framework/db/ColumnSchemaBuilder.php#L265" class="tool-link" title="edit on github"><span class="glyphicon glyphicon-pencil"></span></a>
            <a href="https://github.com/yiisoft/yii2/blob/master/framework/db/ColumnSchemaBuilder.php#L265" class="tool-link" title="view source on github"><span class="glyphicon glyphicon-eye-open"></span></a>
        
        append()
        <span class="detail-header-tag small">
            public                                    method
                            (available since version 2.0.9)
                    </span>
    </div>

    <div class="doc-description">
        <p><strong>Specify additional SQL to be appended to schema string.</strong></p>

        
            </div>

    <table class="detail-table table table-striped table-bordered table-hover">
        <tr><td colspan="3" class="signature"><span class="signature-defs">public</span> <span class="signature-type"><a href="yii-db-columnschemabuilder.html">$this</a></span> <strong><a href="yii-db-columnschemabuilder.html#append()-detail">append</a></strong> ( <span style="color: #0000BB">$sql</span> )</td></tr>
                                    <tr>
                  <td class="param-name-col"><span style="color: #0000BB">$sql</span></td>
                  <td class="param-type-col"><a href="http://www.php.net/language.types.string">string</a></td>
                  <td class="param-desc-col"><p>The SQL string to be appended.</p>
</td>
                </tr>
                                                </table>

<!--	-->

    <div class="detail-header h3" id="buildAfterString()-detail">
        <a href="#" class="tool-link" title="go to top"><span class="glyphicon glyphicon-arrow-up"></span></a>
        <a class="tool-link hash" href="yii-db-columnschemabuilder.html#buildAfterString()-detail" title="direct link to this method"><span class="glyphicon icon-hash"></span></a>
                    <a href="https://github.com/yiisoft/yii2/edit/master/framework/db/ColumnSchemaBuilder.php#L383" class="tool-link" title="edit on github"><span class="glyphicon glyphicon-pencil"></span></a>
            <a href="https://github.com/yiisoft/yii2/blob/master/framework/db/ColumnSchemaBuilder.php#L383" class="tool-link" title="view source on github"><span class="glyphicon glyphicon-eye-open"></span></a>
        
        buildAfterString()
        <span class="detail-header-tag small">
            protected                                    method
                            (available since version 2.0.8)
                    </span>
    </div>

    <div class="doc-description">
        <p><strong>Builds the after constraint for the column. Defaults to unsupported.</strong></p>

        
            </div>

    <table class="detail-table table table-striped table-bordered table-hover">
        <tr><td colspan="3" class="signature"><span class="signature-defs">protected</span> <span class="signature-type"><a href="http://www.php.net/language.types.string">string</a></span> <strong><a href="yii-db-columnschemabuilder.html#buildAfterString()-detail">buildAfterString</a></strong> ( )</td></tr>
                                                <tr>
                  <th class="param-name-col">return</th>
                  <td class="param-type-col"><a href="http://www.php.net/language.types.string">string</a></td>
                  <td class="param-desc-col"><p>A string containing the AFTER constraint.</p>
</td>
                </tr>
                                    </table>

<!--	-->

    <div class="detail-header h3" id="buildAppendString()-detail">
        <a href="#" class="tool-link" title="go to top"><span class="glyphicon glyphicon-arrow-up"></span></a>
        <a class="tool-link hash" href="yii-db-columnschemabuilder.html#buildAppendString()-detail" title="direct link to this method"><span class="glyphicon icon-hash"></span></a>
                    <a href="https://github.com/yiisoft/yii2/edit/master/framework/db/ColumnSchemaBuilder.php#L403" class="tool-link" title="edit on github"><span class="glyphicon glyphicon-pencil"></span></a>
            <a href="https://github.com/yiisoft/yii2/blob/master/framework/db/ColumnSchemaBuilder.php#L403" class="tool-link" title="view source on github"><span class="glyphicon glyphicon-eye-open"></span></a>
        
        buildAppendString()
        <span class="detail-header-tag small">
            protected                                    method
                            (available since version 2.0.9)
                    </span>
    </div>

    <div class="doc-description">
        <p><strong>Builds the custom string that's appended to column definition.</strong></p>

        
            </div>

    <table class="detail-table table table-striped table-bordered table-hover">
        <tr><td colspan="3" class="signature"><span class="signature-defs">protected</span> <span class="signature-type"><a href="http://www.php.net/language.types.string">string</a></span> <strong><a href="yii-db-columnschemabuilder.html#buildAppendString()-detail">buildAppendString</a></strong> ( )</td></tr>
                                                <tr>
                  <th class="param-name-col">return</th>
                  <td class="param-type-col"><a href="http://www.php.net/language.types.string">string</a></td>
                  <td class="param-desc-col"><p>Custom string to append.</p>
</td>
                </tr>
                                    </table>

<!--	-->

    <div class="detail-header h3" id="buildCheckString()-detail">
        <a href="#" class="tool-link" title="go to top"><span class="glyphicon glyphicon-arrow-up"></span></a>
        <a class="tool-link hash" href="yii-db-columnschemabuilder.html#buildCheckString()-detail" title="direct link to this method"><span class="glyphicon icon-hash"></span></a>
                    <a href="https://github.com/yiisoft/yii2/edit/master/framework/db/ColumnSchemaBuilder.php#L363" class="tool-link" title="edit on github"><span class="glyphicon glyphicon-pencil"></span></a>
            <a href="https://github.com/yiisoft/yii2/blob/master/framework/db/ColumnSchemaBuilder.php#L363" class="tool-link" title="view source on github"><span class="glyphicon glyphicon-eye-open"></span></a>
        
        buildCheckString()
        <span class="detail-header-tag small">
            protected                                    method
                    </span>
    </div>

    <div class="doc-description">
        <p><strong>Builds the check constraint for the column.</strong></p>

        
            </div>

    <table class="detail-table table table-striped table-bordered table-hover">
        <tr><td colspan="3" class="signature"><span class="signature-defs">protected</span> <span class="signature-type"><a href="http://www.php.net/language.types.string">string</a></span> <strong><a href="yii-db-columnschemabuilder.html#buildCheckString()-detail">buildCheckString</a></strong> ( )</td></tr>
                                                <tr>
                  <th class="param-name-col">return</th>
                  <td class="param-type-col"><a href="http://www.php.net/language.types.string">string</a></td>
                  <td class="param-desc-col"><p>A string containing the CHECK constraint.</p>
</td>
                </tr>
                                    </table>

<!--	-->

    <div class="detail-header h3" id="buildCommentString()-detail">
        <a href="#" class="tool-link" title="go to top"><span class="glyphicon glyphicon-arrow-up"></span></a>
        <a class="tool-link hash" href="yii-db-columnschemabuilder.html#buildCommentString()-detail" title="direct link to this method"><span class="glyphicon icon-hash"></span></a>
                    <a href="https://github.com/yiisoft/yii2/edit/master/framework/db/ColumnSchemaBuilder.php#L423" class="tool-link" title="edit on github"><span class="glyphicon glyphicon-pencil"></span></a>
            <a href="https://github.com/yiisoft/yii2/blob/master/framework/db/ColumnSchemaBuilder.php#L423" class="tool-link" title="view source on github"><span class="glyphicon glyphicon-eye-open"></span></a>
        
        buildCommentString()
        <span class="detail-header-tag small">
            protected                                    method
                            (available since version 2.0.8)
                    </span>
    </div>

    <div class="doc-description">
        <p><strong>Builds the comment specification for the column.</strong></p>

        
            </div>

    <table class="detail-table table table-striped table-bordered table-hover">
        <tr><td colspan="3" class="signature"><span class="signature-defs">protected</span> <span class="signature-type"><a href="http://www.php.net/language.types.string">string</a></span> <strong><a href="yii-db-columnschemabuilder.html#buildCommentString()-detail">buildCommentString</a></strong> ( )</td></tr>
                                                <tr>
                  <th class="param-name-col">return</th>
                  <td class="param-type-col"><a href="http://www.php.net/language.types.string">string</a></td>
                  <td class="param-desc-col"><p>A string containing the COMMENT keyword and the comment itself</p>
</td>
                </tr>
                                    </table>

<!--	-->

    <div class="detail-header h3" id="buildCompleteString()-detail">
        <a href="#" class="tool-link" title="go to top"><span class="glyphicon glyphicon-arrow-up"></span></a>
        <a class="tool-link hash" href="yii-db-columnschemabuilder.html#buildCompleteString()-detail" title="direct link to this method"><span class="glyphicon icon-hash"></span></a>
                    <a href="https://github.com/yiisoft/yii2/edit/master/framework/db/ColumnSchemaBuilder.php#L434" class="tool-link" title="edit on github"><span class="glyphicon glyphicon-pencil"></span></a>
            <a href="https://github.com/yiisoft/yii2/blob/master/framework/db/ColumnSchemaBuilder.php#L434" class="tool-link" title="view source on github"><span class="glyphicon glyphicon-eye-open"></span></a>
        
        buildCompleteString()
        <span class="detail-header-tag small">
            protected                                    method
                            (available since version 2.0.8)
                    </span>
    </div>

    <div class="doc-description">
        <p><strong>Returns the complete column definition from input format</strong></p>

        
            </div>

    <table class="detail-table table table-striped table-bordered table-hover">
        <tr><td colspan="3" class="signature"><span class="signature-defs">protected</span> <span class="signature-type"><a href="http://www.php.net/language.types.string">string</a></span> <strong><a href="yii-db-columnschemabuilder.html#buildCompleteString()-detail">buildCompleteString</a></strong> ( <span style="color: #0000BB">$format</span> )</td></tr>
                                    <tr>
                  <td class="param-name-col"><span style="color: #0000BB">$format</span></td>
                  <td class="param-type-col"><a href="http://www.php.net/language.types.string">string</a></td>
                  <td class="param-desc-col"><p>The format of the definition.</p>
</td>
                </tr>
                                        <tr>
                  <th class="param-name-col">return</th>
                  <td class="param-type-col"><a href="http://www.php.net/language.types.string">string</a></td>
                  <td class="param-desc-col"><p>A string containing the complete column definition.</p>
</td>
                </tr>
                                    </table>

<!--	-->

    <div class="detail-header h3" id="buildDefaultString()-detail">
        <a href="#" class="tool-link" title="go to top"><span class="glyphicon glyphicon-arrow-up"></span></a>
        <a class="tool-link hash" href="yii-db-columnschemabuilder.html#buildDefaultString()-detail" title="direct link to this method"><span class="glyphicon icon-hash"></span></a>
                    <a href="https://github.com/yiisoft/yii2/edit/master/framework/db/ColumnSchemaBuilder.php#L331" class="tool-link" title="edit on github"><span class="glyphicon glyphicon-pencil"></span></a>
            <a href="https://github.com/yiisoft/yii2/blob/master/framework/db/ColumnSchemaBuilder.php#L331" class="tool-link" title="view source on github"><span class="glyphicon glyphicon-eye-open"></span></a>
        
        buildDefaultString()
        <span class="detail-header-tag small">
            protected                                    method
                    </span>
    </div>

    <div class="doc-description">
        <p><strong>Builds the default value specification for the column.</strong></p>

        
            </div>

    <table class="detail-table table table-striped table-bordered table-hover">
        <tr><td colspan="3" class="signature"><span class="signature-defs">protected</span> <span class="signature-type"><a href="http://www.php.net/language.types.string">string</a></span> <strong><a href="yii-db-columnschemabuilder.html#buildDefaultString()-detail">buildDefaultString</a></strong> ( )</td></tr>
                                                <tr>
                  <th class="param-name-col">return</th>
                  <td class="param-type-col"><a href="http://www.php.net/language.types.string">string</a></td>
                  <td class="param-desc-col"><p>String with default value of column.</p>
</td>
                </tr>
                                    </table>

<!--	-->

    <div class="detail-header h3" id="buildFirstString()-detail">
        <a href="#" class="tool-link" title="go to top"><span class="glyphicon glyphicon-arrow-up"></span></a>
        <a class="tool-link hash" href="yii-db-columnschemabuilder.html#buildFirstString()-detail" title="direct link to this method"><span class="glyphicon icon-hash"></span></a>
                    <a href="https://github.com/yiisoft/yii2/edit/master/framework/db/ColumnSchemaBuilder.php#L393" class="tool-link" title="edit on github"><span class="glyphicon glyphicon-pencil"></span></a>
            <a href="https://github.com/yiisoft/yii2/blob/master/framework/db/ColumnSchemaBuilder.php#L393" class="tool-link" title="view source on github"><span class="glyphicon glyphicon-eye-open"></span></a>
        
        buildFirstString()
        <span class="detail-header-tag small">
            protected                                    method
                            (available since version 2.0.8)
                    </span>
    </div>

    <div class="doc-description">
        <p><strong>Builds the first constraint for the column. Defaults to unsupported.</strong></p>

        
            </div>

    <table class="detail-table table table-striped table-bordered table-hover">
        <tr><td colspan="3" class="signature"><span class="signature-defs">protected</span> <span class="signature-type"><a href="http://www.php.net/language.types.string">string</a></span> <strong><a href="yii-db-columnschemabuilder.html#buildFirstString()-detail">buildFirstString</a></strong> ( )</td></tr>
                                                <tr>
                  <th class="param-name-col">return</th>
                  <td class="param-type-col"><a href="http://www.php.net/language.types.string">string</a></td>
                  <td class="param-desc-col"><p>A string containing the FIRST constraint.</p>
</td>
                </tr>
                                    </table>

<!--	-->

    <div class="detail-header h3" id="buildLengthString()-detail">
        <a href="#" class="tool-link" title="go to top"><span class="glyphicon glyphicon-arrow-up"></span></a>
        <a class="tool-link hash" href="yii-db-columnschemabuilder.html#buildLengthString()-detail" title="direct link to this method"><span class="glyphicon icon-hash"></span></a>
                    <a href="https://github.com/yiisoft/yii2/edit/master/framework/db/ColumnSchemaBuilder.php#L291" class="tool-link" title="edit on github"><span class="glyphicon glyphicon-pencil"></span></a>
            <a href="https://github.com/yiisoft/yii2/blob/master/framework/db/ColumnSchemaBuilder.php#L291" class="tool-link" title="view source on github"><span class="glyphicon glyphicon-eye-open"></span></a>
        
        buildLengthString()
        <span class="detail-header-tag small">
            protected                                    method
                    </span>
    </div>

    <div class="doc-description">
        <p><strong>Builds the length/precision part of the column.</strong></p>

        
            </div>

    <table class="detail-table table table-striped table-bordered table-hover">
        <tr><td colspan="3" class="signature"><span class="signature-defs">protected</span> <span class="signature-type"><a href="http://www.php.net/language.types.string">string</a></span> <strong><a href="yii-db-columnschemabuilder.html#buildLengthString()-detail">buildLengthString</a></strong> ( )</td></tr>
            </table>

<!--	-->

    <div class="detail-header h3" id="buildNotNullString()-detail">
        <a href="#" class="tool-link" title="go to top"><span class="glyphicon glyphicon-arrow-up"></span></a>
        <a class="tool-link hash" href="yii-db-columnschemabuilder.html#buildNotNullString()-detail" title="direct link to this method"><span class="glyphicon icon-hash"></span></a>
                    <a href="https://github.com/yiisoft/yii2/edit/master/framework/db/ColumnSchemaBuilder.php#L307" class="tool-link" title="edit on github"><span class="glyphicon glyphicon-pencil"></span></a>
            <a href="https://github.com/yiisoft/yii2/blob/master/framework/db/ColumnSchemaBuilder.php#L307" class="tool-link" title="view source on github"><span class="glyphicon glyphicon-eye-open"></span></a>
        
        buildNotNullString()
        <span class="detail-header-tag small">
            protected                                    method
                    </span>
    </div>

    <div class="doc-description">
        <p><strong>Builds the not null constraint for the column.</strong></p>

        
            </div>

    <table class="detail-table table table-striped table-bordered table-hover">
        <tr><td colspan="3" class="signature"><span class="signature-defs">protected</span> <span class="signature-type"><a href="http://www.php.net/language.types.string">string</a></span> <strong><a href="yii-db-columnschemabuilder.html#buildNotNullString()-detail">buildNotNullString</a></strong> ( )</td></tr>
                                                <tr>
                  <th class="param-name-col">return</th>
                  <td class="param-type-col"><a href="http://www.php.net/language.types.string">string</a></td>
                  <td class="param-desc-col"><p>Returns 'NOT NULL' if <a href="yii-db-columnschemabuilder.html#$isNotNull-detail">$isNotNull</a> is true,
'NULL' if <a href="yii-db-columnschemabuilder.html#$isNotNull-detail">$isNotNull</a> is false or an empty string otherwise.</p>
</td>
                </tr>
                                    </table>

<!--	-->

    <div class="detail-header h3" id="buildUniqueString()-detail">
        <a href="#" class="tool-link" title="go to top"><span class="glyphicon glyphicon-arrow-up"></span></a>
        <a class="tool-link hash" href="yii-db-columnschemabuilder.html#buildUniqueString()-detail" title="direct link to this method"><span class="glyphicon icon-hash"></span></a>
                    <a href="https://github.com/yiisoft/yii2/edit/master/framework/db/ColumnSchemaBuilder.php#L322" class="tool-link" title="edit on github"><span class="glyphicon glyphicon-pencil"></span></a>
            <a href="https://github.com/yiisoft/yii2/blob/master/framework/db/ColumnSchemaBuilder.php#L322" class="tool-link" title="view source on github"><span class="glyphicon glyphicon-eye-open"></span></a>
        
        buildUniqueString()
        <span class="detail-header-tag small">
            protected                                    method
                    </span>
    </div>

    <div class="doc-description">
        <p><strong>Builds the unique constraint for the column.</strong></p>

        
            </div>

    <table class="detail-table table table-striped table-bordered table-hover">
        <tr><td colspan="3" class="signature"><span class="signature-defs">protected</span> <span class="signature-type"><a href="http://www.php.net/language.types.string">string</a></span> <strong><a href="yii-db-columnschemabuilder.html#buildUniqueString()-detail">buildUniqueString</a></strong> ( )</td></tr>
                                                <tr>
                  <th class="param-name-col">return</th>
                  <td class="param-type-col"><a href="http://www.php.net/language.types.string">string</a></td>
                  <td class="param-desc-col"><p>Returns string 'UNIQUE' if <a href="yii-db-columnschemabuilder.html#$isUnique-detail">$isUnique</a> is true, otherwise it returns an empty string.</p>
</td>
                </tr>
                                    </table>

<!--	-->

    <div class="detail-header h3" id="buildUnsignedString()-detail">
        <a href="#" class="tool-link" title="go to top"><span class="glyphicon glyphicon-arrow-up"></span></a>
        <a class="tool-link hash" href="yii-db-columnschemabuilder.html#buildUnsignedString()-detail" title="direct link to this method"><span class="glyphicon icon-hash"></span></a>
                    <a href="https://github.com/yiisoft/yii2/edit/master/framework/db/ColumnSchemaBuilder.php#L373" class="tool-link" title="edit on github"><span class="glyphicon glyphicon-pencil"></span></a>
            <a href="https://github.com/yiisoft/yii2/blob/master/framework/db/ColumnSchemaBuilder.php#L373" class="tool-link" title="view source on github"><span class="glyphicon glyphicon-eye-open"></span></a>
        
        buildUnsignedString()
        <span class="detail-header-tag small">
            protected                                    method
                            (available since version 2.0.7)
                    </span>
    </div>

    <div class="doc-description">
        <p><strong>Builds the unsigned string for column. Defaults to unsupported.</strong></p>

        
            </div>

    <table class="detail-table table table-striped table-bordered table-hover">
        <tr><td colspan="3" class="signature"><span class="signature-defs">protected</span> <span class="signature-type"><a href="http://www.php.net/language.types.string">string</a></span> <strong><a href="yii-db-columnschemabuilder.html#buildUnsignedString()-detail">buildUnsignedString</a></strong> ( )</td></tr>
                                                <tr>
                  <th class="param-name-col">return</th>
                  <td class="param-type-col"><a href="http://www.php.net/language.types.string">string</a></td>
                  <td class="param-desc-col"><p>A string containing UNSIGNED keyword.</p>
</td>
                </tr>
                                    </table>

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    <div class="detail-header h3" id="check()-detail">
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        <a class="tool-link hash" href="yii-db-columnschemabuilder.html#check()-detail" title="direct link to this method"><span class="glyphicon icon-hash"></span></a>
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        check()
        <span class="detail-header-tag small">
            public                                    method
                    </span>
    </div>

    <div class="doc-description">
        <p><strong>Sets a <code>CHECK</code> constraint for the column.</strong></p>

        
            </div>

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        <tr><td colspan="3" class="signature"><span class="signature-defs">public</span> <span class="signature-type"><a href="yii-db-columnschemabuilder.html">$this</a></span> <strong><a href="yii-db-columnschemabuilder.html#check()-detail">check</a></strong> ( <span style="color: #0000BB">$check</span> )</td></tr>
                                    <tr>
                  <td class="param-name-col"><span style="color: #0000BB">$check</span></td>
                  <td class="param-type-col"><a href="http://www.php.net/language.types.string">string</a></td>
                  <td class="param-desc-col"><p>The SQL of the <code>CHECK</code> constraint to be added.</p>
</td>
                </tr>
                                                </table>

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    <div class="detail-header h3" id="comment()-detail">
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        comment()
        <span class="detail-header-tag small">
            public                                    method
                            (available since version 2.0.8)
                    </span>
    </div>

    <div class="doc-description">
        <p><strong>Specifies the comment for column.</strong></p>

        
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        <tr><td colspan="3" class="signature"><span class="signature-defs">public</span> <span class="signature-type"><a href="yii-db-columnschemabuilder.html">$this</a></span> <strong><a href="yii-db-columnschemabuilder.html#comment()-detail">comment</a></strong> ( <span style="color: #0000BB">$comment</span> )</td></tr>
                                    <tr>
                  <td class="param-name-col"><span style="color: #0000BB">$comment</span></td>
                  <td class="param-type-col"><a href="http://www.php.net/language.types.string">string</a></td>
                  <td class="param-desc-col"><p>The comment</p>
</td>
                </tr>
                                                </table>

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    <div class="detail-header h3" id="defaultExpression()-detail">
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        defaultExpression()
        <span class="detail-header-tag small">
            public                                    method
                            (available since version 2.0.7)
                    </span>
    </div>

    <div class="doc-description">
        <p><strong>Specify the default SQL expression for the column.</strong></p>

        
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        <tr><td colspan="3" class="signature"><span class="signature-defs">public</span> <span class="signature-type"><a href="yii-db-columnschemabuilder.html">$this</a></span> <strong><a href="yii-db-columnschemabuilder.html#defaultExpression()-detail">defaultExpression</a></strong> ( <span style="color: #0000BB">$default</span> )</td></tr>
                                    <tr>
                  <td class="param-name-col"><span style="color: #0000BB">$default</span></td>
                  <td class="param-type-col"><a href="http://www.php.net/language.types.string">string</a></td>
                  <td class="param-desc-col"><p>The default value expression.</p>
</td>
                </tr>
                                                </table>

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    <div class="detail-header h3" id="defaultValue()-detail">
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        defaultValue()
        <span class="detail-header-tag small">
            public                                    method
                    </span>
    </div>

    <div class="doc-description">
        <p><strong>Specify the default value for the column.</strong></p>

        
            </div>

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        <tr><td colspan="3" class="signature"><span class="signature-defs">public</span> <span class="signature-type"><a href="yii-db-columnschemabuilder.html">$this</a></span> <strong><a href="yii-db-columnschemabuilder.html#defaultValue()-detail">defaultValue</a></strong> ( <span style="color: #0000BB">$default</span> )</td></tr>
                                    <tr>
                  <td class="param-name-col"><span style="color: #0000BB">$default</span></td>
                  <td class="param-type-col">mixed</td>
                  <td class="param-desc-col"><p>The default value.</p>
</td>
                </tr>
                                                </table>

<!--	-->

    <div class="detail-header h3" id="first()-detail">
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        first()
        <span class="detail-header-tag small">
            public                                    method
                            (available since version 2.0.8)
                    </span>
    </div>

    <div class="doc-description">
        <p><strong>Adds an <code>FIRST</code> constraint to the column.</strong></p>

        <p>Note: MySQL, Oracle and Cubrid support only.</p>

            </div>

    <table class="detail-table table table-striped table-bordered table-hover">
        <tr><td colspan="3" class="signature"><span class="signature-defs">public</span> <span class="signature-type"><a href="yii-db-columnschemabuilder.html">$this</a></span> <strong><a href="yii-db-columnschemabuilder.html#first()-detail">first</a></strong> ( )</td></tr>
            </table>

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    <div class="detail-header h3" id="getTypeCategory()-detail">
        <a href="#" class="tool-link" title="go to top"><span class="glyphicon glyphicon-arrow-up"></span></a>
        <a class="tool-link hash" href="yii-db-columnschemabuilder.html#getTypeCategory()-detail" title="direct link to this method"><span class="glyphicon icon-hash"></span></a>
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        getTypeCategory()
        <span class="detail-header-tag small">
            protected                                    method
                            (available since version 2.0.8)
                    </span>
    </div>

    <div class="doc-description">
        <p><strong>Returns the category of the column type.</strong></p>

        
            </div>

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        <tr><td colspan="3" class="signature"><span class="signature-defs">protected</span> <span class="signature-type"><a href="http://www.php.net/language.types.string">string</a></span> <strong><a href="yii-db-columnschemabuilder.html#getTypeCategory()-detail">getTypeCategory</a></strong> ( )</td></tr>
                                                <tr>
                  <th class="param-name-col">return</th>
                  <td class="param-type-col"><a href="http://www.php.net/language.types.string">string</a></td>
                  <td class="param-desc-col"><p>A string containing the column type category name.</p>
</td>
                </tr>
                                    </table>

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    <div class="detail-header h3" id="notNull()-detail">
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        notNull()
        <span class="detail-header-tag small">
            public                                    method
                    </span>
    </div>

    <div class="doc-description">
        <p><strong>Adds a <code>NOT NULL</code> constraint to the column.</strong></p>

        
            </div>

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        <tr><td colspan="3" class="signature"><span class="signature-defs">public</span> <span class="signature-type"><a href="yii-db-columnschemabuilder.html">$this</a></span> <strong><a href="yii-db-columnschemabuilder.html#notNull()-detail">notNull</a></strong> ( )</td></tr>
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            <a href="https://github.com/yiisoft/yii2/blob/master/framework/db/ColumnSchemaBuilder.php#L149" class="tool-link" title="view source on github"><span class="glyphicon glyphicon-eye-open"></span></a>
        
        null()
        <span class="detail-header-tag small">
            public                                    method
                            (available since version 2.0.9)
                    </span>
    </div>

    <div class="doc-description">
        <p><strong>Adds a <code>NULL</code> constraint to the column</strong></p>

        
            </div>

    <table class="detail-table table table-striped table-bordered table-hover">
        <tr><td colspan="3" class="signature"><span class="signature-defs">public</span> <span class="signature-type"><a href="yii-db-columnschemabuilder.html">$this</a></span> <strong><a href="yii-db-columnschemabuilder.html#null()-detail">null</a></strong> ( )</td></tr>
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        unique()
        <span class="detail-header-tag small">
            public                                    method
                    </span>
    </div>

    <div class="doc-description">
        <p><strong>Adds a <code>UNIQUE</code> constraint to the column.</strong></p>

        
            </div>

    <table class="detail-table table table-striped table-bordered table-hover">
        <tr><td colspan="3" class="signature"><span class="signature-defs">public</span> <span class="signature-type"><a href="yii-db-columnschemabuilder.html">$this</a></span> <strong><a href="yii-db-columnschemabuilder.html#unique()-detail">unique</a></strong> ( )</td></tr>
            </table>

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        unsigned()
        <span class="detail-header-tag small">
            public                                    method
                            (available since version 2.0.7)
                    </span>
    </div>

    <div class="doc-description">
        <p><strong>Marks column as unsigned.</strong></p>

        
            </div>

    <table class="detail-table table table-striped table-bordered table-hover">
        <tr><td colspan="3" class="signature"><span class="signature-defs">public</span> <span class="signature-type"><a href="yii-db-columnschemabuilder.html">$this</a></span> <strong><a href="yii-db-columnschemabuilder.html#unsigned()-detail">unsigned</a></strong> ( )</td></tr>
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